High-nickel electrode sheet having reduced reactivity with moisture and manufacturing method therefor
a technology of high-nickel electrodes and manufacturing methods, which is applied in the field of high-nickel electrode sheets having reduced reactivity with moisture and manufacturing methods therefor, can solve the problems of limited application, low structural stability and chemical stability of active materials, and deterioration of thermal stability, so as to improve the capacity characteristics of batteries and improve the lifespan characteristics of batteries
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first embodiment
[0057]In the electrode sheet according to the first embodiment of the present invention, the second positive electrode mixture layer includes the first positive electrode active material and the second positive electrode active material, and the first positive electrode mixture layer may be formed of positive electrode active materials having the same average particle size D50.
[0058]At this time, the average particle size D50 of the positive electrode active material of the first positive electrode mixture layer may be in a range of 9 to 30 μm, preferably 9 to 25 μm, and more preferably 10 to 20 μm. Further, it may be the same as the average particle size of the first positive electrode active material of the second positive electrode mixture layer.
second embodiment
[0059]In the electrode sheet according to a second embodiment of the present invention, the second positive electrode mixture layer may include the first positive electrode active material and the second positive electrode active material, and the first positive electrode mixture layer may include a mixture of the first positive electrode active material having a large particle size and the second positive electrode active material having a small particle size as in the second positive electrode mixture layer.
[0060]At this time, in order for the second positive electrode mixture layer to become relatively stronger in rolling than the first positive electrode mixture layer, a ratio (b / a) of a weight (b) of the second positive electrode active material to a weight (a) of the first positive electrode active material in the second positive electrode mixture layer is greater than a ratio (b′ / a′) of a weight (b′) of the second positive electrode active material to a weight (a′) of the fir...
example 1
[0092](Preparation of First Positive Electrode Slurry for Formation of First Positive Electrode Mixture Layer)
[0093]A first positive electrode active material (D50 is 11 μm) containing the nickel content of 80 mol % based on the total transition metal as the transition metal oxide of lithium-nickel-cobalt-manganese was prepared, which was then mixed with the carbon black conductive material and PVDF binder at the weight ratio of 96.5:1.5:2 in the solvent of N-methyl pyrrolidone, to thereby manufacture a first positive electrode slurry (viscosity: 7000 Pa·s).
[0094](Preparation of Second Positive Electrode Slurry for Formation of Second Positive Electrode Mixture Layer)
[0095]A positive electrode active material was prepared by mixing a first positive electrode active material (D50 is 11 μm), in which the content of nickel corresponds to 80 mol % based on the total transition metal, as a transition metal oxide of lithium-nickel-cobalt-manganese, and a second positive electrode active m...
PUM
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